Seiko Cal. 3840 - 756

The 3840-756 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-fd70d88f764d]

Also known as: Monster, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

18j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1988

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